Hola. It's June 30.

Last week we told you about an amino acid linked to shorter lifespans.

This week: the amino acid linked to longer ones - and the complete diet built around it.

Valter Longo, one of the most respected longevity scientists alive, just published his strongest case yet for a specific diet in Cell Metabolism. 200,000 people. Confirmed in mice. Let's break it down.

The rundown for this week:

Let's get to it. 👇

A butterfly species that lives several times longer than its close relatives shows almost no physical decline with age - scientists at the University of Exeter found Heliconius butterflies have evolved extraordinary longevity and are now hunting the genetic mechanisms behind it. ScienceDaily

NeuroSense's ALS drug hit its primary endpoint - the first time a controlled trial has measurably reduced TDP-43, the protein that defines ALS - TDP-43 is a protein that misfolds and builds up in motor neurons in almost every ALS case; reducing it in a controlled setting is a landmark result. PRNewswire

Rare genetic variants shared by long-lived families may delay disease by cooling inflammation - researchers analyzed 212 long-lived family groups from the Leiden Longevity Study and identified 12 rare protein-altering variants linked to healthspan, including one in the CGAS gene - an inflammation signaling switch - that appears across multiple long-lived families. ScienceDaily

Biogen is presenting 3 years of lecanemab data and early diranersen results at AAIC 2026 in London, July 12-15 - diranersen targets tau (the second key protein that accumulates in Alzheimer's brains) at the RNA level, reducing its production at the source rather than clearing it after the fact. Globe Newswire

VeriSIM Life is partnering with the FDA to test its AI-powered drug safety platform - if validated, AI-assisted safety analysis could compress the preclinical evaluation process for new drugs, including longevity compounds. Longevity.Technology

Last week: an amino acid linked to shorter lifespans in men.

This week: the amino acid that may be central to living longer. And the diet built around getting it exactly right.

A new study in Cell Metabolism, led by Valter Longo of USC's Leonard Davis School of Gerontology with collaborators from Harvard and the University of Toronto, makes the most comprehensive case yet for a specific longevity diet. The team combined mouse experiments with health and dietary data from more than 200,000 people.

The diet: largely plant-based, fish included, small amounts of eggs and dairy. Inspired by traditional Mediterranean and Okinawan eating patterns. Low in protein overall. And precisely calibrated around one amino acid - methionine.

Methionine is an essential amino acid - one of the building blocks your body can't make on its own, involved in DNA methylation - the chemical tagging process that regulates how genes are expressed and is central to how the body ages. The key finding: both too much and too little methionine cancel out the benefits. The sweet spot produced dramatic results.

The science breakdown:

Disclosure worth noting: Longo has equity interest in L-Nutra, a company that develops medical foods including the Fasting-Mimicking Diet. Publicly disclosed in the paper. Doesn't change the quality of the science, but worth knowing.

The practical takeaway: lean toward plants and fish, go easy on protein overall, and get your methionine from food - fish, eggs, small amounts of meat - rather than supplements.

👉 EurekAlert / USC | USC press release

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The longevity diagnostics market has had a blind spot: every biological age test until now used one model for both men and women. Same algorithm, same reference ranges, same assumptions. It's a meaningful gap - published research shows men and women age along different biological timelines, with different drivers and different intervention leverage points.

On June 25, Generation Lab launched SystemAge 2.1 - the first biological age test with dedicated female and male versions.

Built on over two decades of aging research by co-founder Prof. Irina Conboy of UC Berkeley, SystemAge 2.1 measures 460+ biomarkers across 21 organ systems from a single needle-free blood draw. Already deployed in 750+ clinics across 18 countries.

What's new in 2.1:

The business signal: Generation Lab went from $11M seed to 750 clinics in 18 countries in roughly two years. The longevity diagnostics arm is maturing fast - and a gender-specific test that tracks per-organ intervention efficacy for NAD+, peptides, stem cells, hormones, and lifestyle protocols is exactly what precision longevity clinics need.

One caveat: most outcome data cited (average 5.5-year biological age reduction following stem cell protocols) comes from the company's own dataset, not yet independently peer-reviewed. Promising, but worth knowing.

👉 PRNewswire | Longevity.Technology

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Here's the kind of longevity news that deserves more airtime.

A new working paper from MIT economist Amy Finkelstein, published by the National Bureau of Economic Research on June 22, found that Americans at age 66 are not just living longer than they did 25 years ago - they're living those extra years in genuinely better health.

Using Medicare data tracking Americans from 1993 to 2017, the team found that life expectancy at age 66 increased by 2.4 years over that period. Crucially, those extra years "consisted entirely of healthy life-years" - free of the severe physical and cognitive limitations that often define the end of life.

Time spent in a state of severe limitation declined by around 30%. Nursing home and home-health use fell as a result.

"What we're finding is that at every age, health is improving," said Finkelstein. "We're not just living longer; we're living better."

Why it matters: increases in life expectancy can reflect two very different things - delayed aging (you stay healthier longer) or prolonged dying (you live longer but still sick). This data points squarely toward the former.

The researchers point to better pharmaceutical interventions and anti-smoking campaigns as likely contributors. For the longevity field, this is meaningful validation: the gains are real, they show up in population data, and they suggest that the interventions available today - before the longevity drug pipeline even matures - are already working.

👉 TIME | NBER working paper

The scientist from this week's From the Clinic story has also written the best consumer-facing guide to putting his research into practice.

Longo spent 30 years mapping the relationship between diet, fasting, and lifespan - first in yeast, then in mice, then in human epidemiological data and clinical trials. This book is where it all converges: the specific dietary recommendations his research has pointed toward, the fasting periods that appear to trigger cellular repair, and practical frameworks for applying both without turning your life upside down.

The research is solid. Worth knowing: Longo has financial ties to L-Nutra, which sells the Fasting Mimicking Diet his lab developed. Read the book for the dietary framework - you don't need to buy the commercial products to apply the ideas.

Dense in some chapters. Practical throughout.

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